<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>何为数据代理</title>
	</head>
	<body>
		<!-- 数据代理：通过一个对象对另外一个对象中的属性的操作（读/写) -->
		<script type="text/javascript">
			let obj = {x:100}
			let obj2 = {y:100}
			Object.defineProperty(obj2,"x",{
				get(){
					return obj.x
				},
				set(value){
					obj.x = value
				}
			})
		</script>
	</body>
</html>
